Between 1976 and 1977, Granberg worked as a staffer in the Illinois House of Representatives.
[2] Granberg, an attorney, served as a member of the Clinton County Board and was a law partner of James Donnewald.
[3] Granberg was first elected to the Illinois House of Representatives in 1986 after defeating Republican incumbent Dwight Friedrich.
His legislative agenda includes a constitutional amendment to force the legislature to follow the State Mandates Act and provide money for programs they force on local governments.
[5] In 2008, Granberg chose not to run for re-election and was succeeded by retired educator John Cavaletto.